A switch does not need to be made out of both insulators and conductors. A switch can be made entirely out of conductors. A common type of switch called a "knife switch" is made out of two metal blades that can be pivoted to touch or separate from each other. The blades are attached to a metal base, and the entire assembly is mounted on an insulating material such as plastic or ceramic.

When the blades of a knife switch are touching, they conduct electricity. When the blades are separated, the switch is open and does not conduct electricity.

Another common type of switch is called a "toggle switch." Toggle switches are typically made out of plastic and have a metal lever that can be moved up or down. The lever is connected to a metal contact that moves inside the switch. When the lever is in the up position, the contact touches a metal terminal and the switch is closed. When the lever is in the down position, the contact does not touch the terminal and the switch is open.

Toggle switches can be used to control the flow of electricity in a circuit, and are commonly used in household appliances, lighting fixtures, and other electrical devices.